By Kaitlyn Kiernan and Melodie Warner

NEW YORK--The Dow Jones Industrial Average will become a little more health sector-heavy after the close of trading on Sept. 21, when insurer UnitedHealth Group Inc. (UNH) will replace Kraft Foods Inc. (KFT) in the 30-component index.

The shift comes as Kraft Foods, the global-snacks company, begins trading as Mondelez International Inc. It will also make UnitedHealth the second insurer in the blue-chip index, joining Travelers Companies Inc. (TRV), which was added to the Dow during its last shake-up in June 2009.

"The shift reflects the growing importance of health-care expenses in the U.S. economy," said Peter Jankovskis, co-chief investment officer at Oakbrook Investments. "It reflects shifts that have already taken place within the U.S. and so the change makes sense in terms of what the Dow is trying to do as a 30-component representation of the U.S economy."

UnitedHealth, the biggest managed-care company by revenue and membership, will bring added diversification to the health-care aspect of the Dow, while reflecting the growing importance of health-care spending in the U.S., S&P Dow Jones Indices said in a release Friday. Currently, the health-care space in the Dow Jones Industrial Average is entirely represented by pharmaceutical companies with components Johnson & Johnson (JNJ), Merck & Co. Inc. (MRK) and Pfizer Inc. (PFE).

S&P Dow Jones Indices said the Dow Jones Averages Index Committee believes Mondelez's reduced market capitalization and projected lower percentage of revenue makes the company less representative of the U.S. large-cap market space.

Kraft is separating into two publicly traded companies: the global-snacks company Mondelez and the North American grocery business Kraft Foods Group Inc. The split is scheduled for Oct. 1. Earlier this month, Kraft unveiled its strategies for the companies, but the forecast for 2013 earnings fell short of expectations.

Meanwhile, UnitedHealth has seen its profits grow as the uncertain U.S. economy caused many consumers to avoid hospitals and doctors' offices in hopes of saving money. The company reported its second-quarter earnings rose 5.5% as the health insurer's revenue jumped 8%.

With the Dow's unique weighting--with its 30 components weighted by stock price, rather than market value-the swap of UnitedHealth for Kraft makes sense in terms of the similarity in share price, according to Nicholas Colas, chief market strategist at ConvergEx Group.

"Price has to be a consideration because that is the weighting," Mr. Colas said. "It's a logical swap because it doesn't create too much of a disturbance in the weightings of the other components."

Kraft finished at $40.13 on Thursday, while UnitedHealth closed at $53.89.

-Write to Kaitlyn Kiernan at kaitlyn.kiernan@dowjones.com and Melodie Warner at melodie.warner@dowjones.com

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